My experience with synthetics is that they tend to be stronger than similar designations in cane, but those designations vary by manufacturer. And, a reed's "cut" has a lot to do with how it plays on any particular mouthpiece.
For instance, on my soprano Super Session J and Morgan Vintage 7, I use Vandoren Java #2 (generally). But on my soprano Morgan 6, I use Vandoren ZZ #2. There is just something about those mouthpieces that allow those different reed designs to play better on the particular mouthpiece.
And, I adjust (meaning I shave them down to suit my playing) almost every reed I try, but I've found that the ZZ's on my Morgan 6 requires less adjustment than do the Javas on the SS-J or Morgan 7.
So, IF I use a Fibracell synthetic, I use the softest ones available (I tend to soft reeds anyway), but if I try a #2 or 2 1/2 Fibracell because I use those strengths in cane, the synthetics are too hard for me.
This is not something that someone on a forum thread can or should adequately advise you about. Like I wrote before, we are all different and what works for me probably will not work for you. Mouthpiece and reed advice is almost worthless, in my opinion. This is something you MUST work out yourself. True, in some rare cases, I've found others who have similar tastes in mouthpieces and reeds, and when we discover common ground, then our information exchanges work better.
You need to find a good retailer and try the products. If necessary, take a friend with you (or your teacher - whatever) and have them assist you in this decision. OR, you can do like I sometimes do and buy them sight-unseen, but I get the feeling that you are not in the financial position to do that. If you are on a tight budget, go to a store and play them all. DAVE